JPH0464748B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) This invention relates to a rotary joint for a rotary automatic coating machine.

(Prior Art and Problems to be Solved by the Invention) Conventionally, this type of rotary joint has had to be repaired by disassembling the entire shaft every time the seals in the air and paint circuits deteriorate, even if it is just one part. The maintenance was quite troublesome.

Furthermore, if one circuit becomes defective, the entire shaft becomes unusable and must be replaced, resulting in a large economic loss.

Furthermore, depending on the coating conditions, the design had to be changed, such as by increasing the number of coating circuits, and each time a different type of joint was required to be manufactured.

In view of the above-mentioned problems of the conventional art, the present invention provides a multi-stage system that allows only the circuits that require repair or replacement to be removed or replaced, and that additional circuits can be added by simply adding them to the existing joint. The purpose is to provide a disassembly type rotary joint.

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration. That is, in the multi-stage disassembly type rotary joint according to the present invention, the main shaft is divided in the longitudinal direction so that each circuit can be separated and disassembled, and each connection is formed at the upper end or the lower end of the circuits, or at both the upper and lower ends. The parts are connected to each other by tightening fasteners.

(Example) Hereinafter, this invention will be applied to a double-acting shaft rotary joint that rotates in synchronization with the revolution of a spray gun and rotates the spray gun by rotatably attaching it to a rotating fixed plate. A concrete example will be described based on the drawings.

The main shaft of this rotary joint is formed by stacking a plurality of circuits 1 to 5 separated in the longitudinal direction in multiple stages, and each circuit 1 to 5 can be separated and disassembled.

First, a flow path 6a passing through each circuit 1 to 5 is formed in the center of the main shaft, and a first air, for example, atomized air, is fed into an opening 7 at one end of the flow path 6a via a joint 8. Connect the air hose 9 for use. On the other hand, the other end of the flow path 6a serves as an air outlet 10, which is piped to one or more spray guns (not shown).

Furthermore, this main shaft has flow channels 6b, 6c, 6d for the second air or for the necessary number of paint systems.
...form as appropriate.

That is, the circuit 1 is provided with a horizontal hole 12 that communicates with a hose 11 for feeding second air, for example, pilot air. Each circuit 1 to 5 is installed in the horizontal hole 12.
One end of the passage 6b passed through is connected, and the other end is piped to a spray gun.

Further, the circuit 2 is provided with a horizontal hole 14 that communicates with a paint hose 13 for feeding the first paint. Side hole 1
4 includes the flow path 6c that passes through each circuit 2 to 5.
One end is connected, and the other end serves as a paint outlet, and is piped to a spray gun via a first paint feed hose 15 connected to the side circumference of the terminal circuit 5.

Further, the circuit 4 is provided with a horizontal hole 17 that communicates with a paint hose 16 for feeding a second paint having a different color from the first paint. One end of the flow path 6c passing through the circuits 4 and 5 is connected to the horizontal hole 17, and the other end is also a paint outlet, and a second paint feedout connected to the side circumference of the terminal circuit 5 is connected to the side hole 17. The paint hose 18 is connected to the spray gun.

Note that the circuit 3 is equipped with a pulley P that transmits rotational force to the entire main shaft.

Each of the circuits 1, 2, 4, and 5 is provided with a packing 19 at its sealing portion, and a cylindrical housing 21 having a ball bearing 20 installed at one end is attached to its outer periphery. Also, ball bearings 20 are installed at both ends on the outer circumference of the circuit 3.
A flanged housing 22 with a flange inside is attached, and the flange part 23 is rotatably arranged at the upper center of the sprayer body and fixed to a fixing plate 24 for rotating the spray gun.

Each housing 21 is provided with a through hole 25 communicating with the horizontal holes 12, 14 and 17 formed in each circuit 1, 2 and 4, and the hoses 11, 13 and 16 described above are connected to the through hole 24, respectively. do. Further, each housing 21 is provided with a support arm 26 protruding from the side circumferential portion, and a vertically extending support column 28 fixed to the fixing plate 24 is inserted into a bifurcated opening 27 formed at the tip thereof. This pillar 2
8, rotation of the housing 21 can be prevented.

Connection portions 29 for connecting the circuits 1 to 5, respectively, are formed at the upper end or the lower end of each circuit 1 to 5, or at both upper and lower ends.

The connecting portion 29 includes, for example, a sloped convex portion 30 formed by notching around the end of the circuit body, and each circuit 1 to 5 can be connected by tightening a stopper 32 to the connecting portion 29. interconnect.

That is, as shown in FIGS. 2 and 3, the stopper 32 has three stopper pieces 32a to 3, which are ring-shaped as a whole and divided into thirds.
2c, and the connecting portion 29 is provided on the inner circumferential surface of the connecting portion 29.
A tapered concave portion 33 is provided which fits into the slope convex portion 30 of the present invention.

In addition, on the outer periphery of each stopper piece 32a to 32c,
A cutout end surface portion 36 for inserting the bolt 35 is formed parallel to the one side end surface 34 thereof.
This end surface portion 36 has the one side end surface 34
A bolt hole 37 penetrating through the hole is formed, while other adjacent fastener pieces 32a to 32 are formed on the other side end surface 38.
A through-threaded hole 39 is made to communicate with the bolt hole 37 formed in c.

Therefore, by screwing in the bolt 35, the fastener pieces 32a to 32c are tightened together, and each circuit 1 to 5 is tightened.
Connect firmly.

Note that 40 is a positioning pin for assembling each of the circuits 1 to 5.

In this embodiment, the pilot air flow path 6
Although pilot air is not necessary depending on the type of spray gun, this flow path 6b may be used for paint. In addition, although the flow path 6d is used for the second paint, if necessary, it may be used as a return flow path for returning unsprayed paint to form a paint circulation circuit. good. In this way, each of the channels 6a to 6d is used in a modified manner depending on the coating conditions.

Further, in this embodiment, an example of the stopper 32 has a three-split structure, but the stopper 32 is not limited to this example, and may be a two-split structure, a three-split structure, or more. Further, although a tapered recess 33 is formed on the inner circumferential surface of this stopper 32 so as to correspond to the sloped protrusion 30, the recess 33 does not necessarily have to be tapered and corresponds to the shape of the protrusion 30. Same protrusion 30
It suffices if it has a shape that fits. However, if it is tapered, the connecting portion 29 can be tightly tightened.

Of course, the stopper 32 is functionally
Any device that can connect the connecting portions 29 of No. 5 to each other by tightening the connecting portions 29 may be used. For example, various known tightening devices may be used or repurposed.

Now, the operation of the multistage disassembly type rotary joint according to the present invention constructed as described above will be explained.

For example, assume that the seal portion of the circuit 2 has deteriorated and its gasket 19 needs to be replaced. At this time, first, the stopper 32 connecting circuit 1 and circuit 2 and the stopper 32 connecting circuit 2 and circuit 3 are respectively removed.

Then, the circuit 1 and the circuit 2 are slightly lifted upward together with their housing 21, the dowel pin 40 connecting the circuit 1 and the circuit 2 is removed, and only the circuit 2 is pulled out along with its housing 21 laterally. When it is pulled out, it is disassembled, the deteriorated gasket 19 is replaced, and the circuit 2 is connected between the circuits 1 and 3 by repeating the operation in reverse.

For example, if it becomes necessary to add a coating circuit depending on coating conditions, the stopper 32 connecting the circuits 4 and 5 is removed and the circuit 5 is pulled out. Then, additional circuits with increased flow paths are successively connected under the circuit 4 in a multi-stage manner. The lower the circuit is located, the more channels there are.

On the other hand, if circuit 4 is removed and circuit 5 is directly connected to circuit 3, the number of painting circuits can be reduced.

FIG. 4 shows another embodiment of the present invention, and the main difference from the previous embodiment is that a mechanical seal 41 is used as the sealing member. Components that perform the same functions as those in the previous embodiment are given the same reference numerals.

Although the above example has shown an embodiment of this invention in a double-acting shaft type rotary joint, it is possible to apply not only a double-acting shaft type rotary joint but also a single-acting shaft type rotary joint, that is, a spray gun that rotates on its axis only by revolution. Needless to say, it can also be applied to a type of rotary joint that does not allow any rotation.

(Effects of the Invention) As is clear from the detailed description above, the multi-stage disassembled rotary joint according to the present invention has the following features:
Since the main shaft is divided into sections so that each circuit can be separated and disassembled, any circuit can be removed or replaced.

Therefore, even if the joint is structurally complex and consists of a plurality of air circuits or paint circuits, it is only necessary to remove the circuit in the repaired or replaced part, making maintenance extremely easy and economical.

Further, even if it becomes necessary to add a coating circuit or the like depending on the coating conditions, it can be done simply by adding circuits in multiple stages, and there is no need to create a different type of joint.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the multi-stage disassembled rotary joint according to the present invention, FIG. 2 is an exploded perspective view of the circuit connection part, FIG. 3 is a plan view of the stopper, and FIG. It is a longitudinal cross-sectional view which shows another Example. 1 to 5...Circuit, 29...Connection portion, 30...Gradient convex portion, 32...Stopper, 33...Tapered recess.

Claims (1)

[Claims] 1. The main shaft is divided into sections in the longitudinal direction so that each circuit can be separated and disassembled, and a stopper is tightened at each connection portion formed at the upper end or the lower end of the circuits, or at both the upper and lower ends. A multi-stage disassembly type rotary joint that is interconnected. 2 The stopper is ring-shaped as a whole and is divided into a plurality of parts, each of which has a tapered recess on its inner circumferential surface that fits into the sloped protrusion formed at the connection part of each circuit. A multi-stage disassembly type rotary joint according to claim 1.